Known Versions:

Notes for this version: You can have 4 differentes levels to play (Easy, Mean, Hard, Expert) . Now You can play in limited time. How to use it: R: Allows to increment the number to be placed on the grid L: Allows to decrease the number to be placed on the grid Cross: Place the number on the selected boxSquare: Delete the number posted of the selected boxTriangle: Show the whole grid to help you